BS EN 50123-5:1999 Railway applications - Fixed installations - d.c. switchgear - Surge arresters and low-voltage limiters for specific use in d.c. systems
2012BS EN 50526-1:2012 Railway applications. Fixed Installations. D.C. surge arresters and voltage limiting devices. Surge arresters
2003BS EN 50123-5:2003 Railway applications. Fixed installations. D.C. switchgear. Surge arresters and low-voltage limiters for specific use in d.c. systems
1999BS EN 50123-5:1999 Railway applications - Fixed installations - d.c. switchgear - Surge arresters and low-voltage limiters for specific use in d.c. systems